Or would it include virtual circuits, circuit-switched networks (common in telephony) etc.
For example would this be a place to discuss dedicated carrier protocols vs TDMA over Ethernet vs ATM?
Proposal: Network Engineering
I don't think there's any need to restrict the topics arbitrarily like that, as long as its related to Network Engineering. Most of us have to deal with not only ethernet, but ATM, Frame Relay, PON, etc. It all deals with moving data from one point to another. As long as its a technology that Network Engineers deal with daily for the sake of moving data (sans telephony/VOIP, since that may be better for suited for a different community), I think it should be fair game. This definitely includes circuit-switched technologies.
The Telecommunications proposal seems a little broad, but from how I read it, it mostly covers Telco-level technologies. By its very nature, it will cover a lot of the same technologies, since the Internet was built on top of the back of Telcos.
There's a Telecommunications proposal in the works too, and I think it'd be best to avoid any overlap with that. I think the focus of this site should be geared toward data networking.